Levi JohnstonGets Another Chick Pregnant

4/3/2012 7:45 AM PDT

Levi Johnston Gets Another Girlfriend Pregnant

Say what you will about 21-year-old Levi Johnston, but his sperm is world class -- he's gotten another girl pregnant out of wedlock.

Sources tell TMZ ... the lucky woman is Sunny Oglesby, a 20-year-old school teacher from Wasilla, Alaska. Levi has been dating her for just over a year. We're told she's in the very early stages of pregnancy -- less than 3 months.

Sunny isn't showing, which may be why Levi hasn't told someone else his secret -- and that would be Bristol Palin, his other baby mama.

Levi is telling friends Sarah Palin and Todd have completely alienated him from his son Tripp, and he barely sees him as a result. Levi says Sarah and Todd have lied to him, telling him Bristol and Tripp were out of town when they were not.

As a result, we're told Levi is "so excited" about starting his new family.